Midterm Chemistry Quiz
Quiz
•
Chemistry
•
9th Grade
•
Practice Problem
•
Hard
+1
Standards-aligned
Andrew Vu
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12 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the missing coefficient for oxygen gas (O₂) in the balanced equation? C₄H₁₀ + O₂ → CO₂ + H₂O
5
6
8
10
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A student incorrectly balances an equation by changing subscripts instead of coefficients. Why is this incorrect?
It violates the Law of Conservation of Energy
It changes the identity of the substances involved
It only works for synthesis reactions
It does not affect the equation
Tags
NGSS.HS-PS1-7
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
If 4.5 moles of H₂ react with excess oxygen, how many moles of H₂O are produced? 2H₂ + O₂ → 2H₂O
2.25 moles
4.5 moles
6.75 moles
9.0 moles
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A chemical reaction follows a 3:2 ratio of reactants. If a student starts with 12.0 moles of one reactant, how many moles of the other reactant are needed?
4.0 moles
8.0 moles
12.0 moles
18.0 moles
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
In a lab experiment, a student combines 15.0 g of aluminum with excess oxygen. The theoretical yield of aluminum oxide is 28.3 g. If the actual yield is 25.1 g, what is the percent yield?
74.2%
88.7%
93.1%
98.6%
Tags
NGSS.HS-PS1-7
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When determining the limiting reactant, what is the first step?
Convert reactants to mass
Convert reactants to moles
Divide the given mass by the molar mass
Predict the reaction products
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which combination of reactants will result in a precipitate?
NaCl + KNO₃
MgCl₂ + AgNO₃
HCl + NaOH
CuSO₄ + Na₂SO₄
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